Friction-wheel gear



July 7, r1925. 1,544,697

w. sTox-:cKlcHT FRICTION WHEEL` GEAR Filed Jan. 4, 1923 llaa/ankh ffarin Patented July 7, 1925.

PATENT OFFICE.

WILHELM STOECKICHT, 0F MUNICH, GERMANY.

FRICTION -WHEEL GEAR.

Application filed January 4, 1923. Serial No. 610,631.

To all whom. t may concern:

Be it known that I, WILHELM S'roEcxrcH'r, a citizen of the GermanRepublic, residing at Munich, Germany, have invented certain new anduseful Improvements in FrictionlVheel Gear (for which I have filed anapplication for patent of addition in Germany on the 23rd of January,1922), of which the following is a specification.

This invention relates to a friction wheel gear of the type described inm patent application Serial Number 484,;19, Patent Number 1,416,905, inwhich the friction wheels are in contact so that the tangent intersectsthe axes of rotation of the wheels at the point of contact of thefriction surfaces. According to the prior patent one of the frictionwheels is loosely mounted upon the driving shaft and engages by means ofpins or rollers in grooves of the shaft so that during the rotatlon ofshaft the one friction Wheel is displaced with regard to the otherfriction wheel keyed upon the shaft to be driven.

The improvement and further development consists in that the loosedriving wheel which is movable in axial direction is directly mounted inthe casing and that the device for producin the contact pressure is nolonger arranged mside the friction wheel. The necessary axialdisplacement of the friction wheel is controlled from the shaft by meansof studs, rollers, balls or the like through the intermediary of camdisks situated outside the bearing proper of the driving gear andconsequently accessible at any time for examination and repairs. Thebearing of the driving wheel must be of such a construction that itpermits of a certain axial play of the friction wheel, whereby theresult is obtained that the device for regulatingv the contact pressureneed no longer operate under the bearing pressure and can be arrangedoutside the casing.

Two forms of construction of the invention are shown on the drawing.

Fig. 1 shows the friction wheel drive in section.

Fig. 2 is a plan view of the cam disk with the roller drives by whichthe axial displacement of one friction wheel is effected.

Fig. 3 shows in cross section a form of construction in which instead ofrollers balls and two cam disks are used.

Fig. 4 is a plan view of the form of construct-ion shown in Fig. 3, and'Fig. 5 shows the arrangement of thevbearings, which permit of an axialdisplacement of one friction wheel in the direction of the arrow withoutthe production of sliding friction.

The fundamental arrangement of the device is similar to that describedin my prior patent. It is evidently of no importance for the operationwhether the shaft engages with rollers in grooves connected with thefriction wheel or inversely. In the present case the form ofconstruction is shown in which the shaft has rollers. The two frictionwheels are again designated by a and b of which the first mentioned ismounted,

upon the driving shaft o, and the second upon the shaft w to be driven.d designates the rollers mounted upon convenient studs z of shaft c andadapted to contact with a cam disk e and rolling upon the curved guideof the cam disk e. A spring f which is not absolutely necessary for theoperation of the device is preferably arranged between the frictionwheel a on the one hand and the cam disk e on the other hand. In thiscase the cam disk e is arranged upon a necklike extension o of thefriction wheel a so that it can be displaced in axial direction but notrevolve due to the projection p integral with cam e which engages ingroove o" in the extension. This spring arrangement has the advantagethat upon actuation only lsmall masses are moved and that the wheels aswell as the shaft do not have to execute large axial displacements. i

In the form of construction illustrated the shafts are mounted in ballbearings Z and Z in the walls g of the Casin The drivingshaft c carriesa collar m whlch bears against a roller step bearing Z2. The collarserves to intercept the axial thrust in the shaft. According to the formof construction shown in' Figs. 3 and 4 one part does not act withrollers in a curved guide of the other part, where the rollers have theeffect that the pressure is transmitted perpendicularly to the curvedguiding, but both parts are connected each by means of similar cam diskswherein, the pressure is transmitted between the two disks by looserollers or balls Ik; guided' in a cage.

'llhe operation of the device is as follows 'fr lf shaft fu is revolvedthe rollers al roll upon the cam disk e and shift the saine against thetension of spring ,f in the direction of the axis. Due to the pressureof spring f the friction wheel is axially displaced and .pressed againstthe friction disk b" until the friction is suliiciently` great totransmit the moment of torsion upon the shaft w. Accordin to the form ofconstruction shown in igs. 3 and 4 the balls or rollers are forced bythe rotation of the cam disk e relative to the `cain disk e to roll uponthe cam disk whereby the two disks are pressed away from one anotherwith an axial force determined by the circumferential force of thecurves in e and e'. rlhis arrangement is not to be confounded with afree-wheel or other arrangements in which balls or rollers are wedged inbetween two surfaces. ln this vcase no wedging action takes place butthe balls have merely the veffect that the pressure is transmitted from.one disk to the other due to an angle prescribed by the curved l ln Fi5 is shown ow the ball bearings Z must v constructed in order to be ableto displace the friction wheel axiall without sliding friction opposingthis axial1 displacement. With this object in view the ou-r and innerraces of the ball Ibearing each have only one shoulder, and theremainder of the race is cylindrical from this shoulder. If now an axialdisplacement of the shaft takes place in the direction of the arrow, theballs roll upon the cylindrical races. The axial force must overcomeonly the very low and uni- Y form rolling resistancies whereby a veryaccurate adjusting of the Contact pressure is ensured.

L Friction gearing comprising a pair of bearing supports; a shaftmounted in said supports and having a wheel securely mounted thereon; afriction wheel rotatably mounted in said supports b means of extensions,oneof the extensions aving a cam thereon; a second shaft mounted finsaid; friction 'wheel; and means on said last-named shaft coacting withsaid cam for forcing said friction wheel axially in said supports intofrictional contact with the first-named wheel upon rotation of saidsecond-namedshaft to rotate the first-named shaft.

2. A friction wheel gear with friction surface standing obliquely to theaxes com rising in combination with the driving siiaft, and with thecasing a friction wheel mounted upon said driving shaft loosely andmovable axial direction and situated directly in said casing, a camdiskand rollers armages? ranged upon the outer side of the frictionwheel and connecting said friction wheel with said driving shaft, and aball bearin for said friction wheel having a cylindrica inner race anda. cylindrical outer race s o that at the axial displacement of saidraces the one towards the other only the rolling friction of the ballshas to be overcome.

3. Friction gearing comprising supports; a shaft mounted in saidsupports and having a wheel rigidly mounted thereon; a friction wheelhaving extended portions thereon, said friction wheel being mounted-insaid supports by means of the extended portions; a cain on one of saidextended portions; a second shaft mounted in said friction wheel; andmeans on said last-named shaft coacting with said cam for forcing saidfriction wheel by means of the extended portions axially in saidsupports into frictional contact with the first-named wheel uponrotation of said second-named shaft -to rotate the first-named shaft.

i. A friction wheel gear with friction surface standing obliquely to theaxes comprising in'combination with` the driving shaft, and with thecasing a friction wheel mounted upon said driving shaft loosely andmowable in axial direction and situated directly in said casing, anextended hub of said friction wheel, a cam disk mounted upon said hub ofthe friction wheel'so that it can be displaced u n the same but notrevolve, a second cam isk opposite said rst mentioned as disk and-ballsbetween said two cam 5. A friction 'wheel gear with friction surfacestanding obliquely to the axes comprising in combination with thedriving shaft, and with the casing a friction wheel mounted upon saiddriving shaft loosely and movable in axial direction and situateddirectlyl in said casing, an extended hub of said friction wheel, a camdisk mounted u hub of the friction wheel so that is can be displacedupon the same but not revolve, a spring between said cam disk and saidfriction wheel, a secondl cam disk opposite said first mentioned camdisk and balls between said two cam disks. 1

6. A friction wheel gear with friction surface standing obliquely to theaxes comprising in combination with the driving shaft, and with thecasing a friction wheel mounted upon said driving shaft loosely andAmovable in axial difrectionand situated directly in said casing, anextended hub of said friction wheel, a cam disk mounted upon said nsaidhub of the friction wheel so that it can be 7. Friction. gearingcomprising bearing supports; a shaft mounted in said supptorts;

a wheel securely mounted on said sha and between -said supports; afriction wheel having extended portions thereon, said friction Wheelbeing mounted in said supports by means of the extended portions; aspring pressed cam on one of said extended ortions; a second shaftrotatably mounted in said friction wheel; and means on said lastnamedshaft coacting with said cam for'forcing said friction wheel axially insaid supports into frictional contact with the firstnamed wheel uponrotation of said secondnamed shaft to rotate the first-namedshaft.

S. Friction gearin comprisin a pair of bearin supports; a s aft rotataby mounted in sai supports; a wheel mounted on and adapted to rotate withsaid shaft; a second wheel having extended portions thereon mounted insaid supports, said wheels being mounted between said supports and oneof said extended portions being elongated and projecting outside of saidsupports; a second shaft mounted coaxially to said second-named wheel,said second-named wheel and said extended portions being rotatablymounted and axially slidalble in said supports; and means for forcingsaid last-named wheel axially into frictional contact with thefirst-named wheel upon rotation of said lastnamed shaft to rotate saidfirst named shaft.

9. Friction gearing comprising supports; a shaft mounted in saidsupports and having a wheel rigidly mounted thereon; a friction wheelhaving extended portions thereon, said friction wheel beingl mounted insaid supports by means of t e extended portions; a

cam on one of said extendedportions; a

second shaft mounted in said friction wheel;

and a plurality of rollers cooperating with said last-named shaft andsaid cam for forcing said frictional whee1 axially in said supports intofrictional 4contact with the first-named wheel uponrotation of saidsecond-named shaft to rotate the first-named shaft.

In testimony whereof I afx my signature in presence of two witnesses. y

' WILHELM STOECKI'CHT. Witnesses:

ALEsEI Pmmrrorr, THERESE KELLY.

